It is a stepper motor + guide for CNC mahine. it can handle a surprising amount of side load.

The main BLDC drive can handle 22Nm. So top wrap will have theoretical 98Nm and bottom wrap 278Nm. Max speed is 200RPM but not sure if I will allow it to go this fast. I’ll have to test it when I get there. I was looking at another motor that could do 150Nm but it was a bit too heavy and I didn’t want to sacrifice too much tether.

This is not a load bearing winch. Its going to be strong enough to handle tether management but the break is electrical.

I went this way for several reasons:

Weight considerations

Maximize the amount of tether

No certifications required

etc

So its not to launch and recover the ROV. For that I call sell a hoist + basket.

I also designed (not yet built) a latching system + bullet but that would be for bigger ROVs…